* The point of major releases is to update the set of common packages we all use. That is, to specify which packages and which versions (corresponding to APIs). The target is to have major releases every 6 months.

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* The point of minor releases is to support a major release across a range of operating systems over time and respond to bugs that are discovered in a library or tool subsequent to their release. The target is to have 2-3 minor releases after major releases at intervals on the order of 4-6 weeks.